2N BlueStar, User Manual

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Plug-In Boards 2.1
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Ext. unit = Indication LEDs of the extension unit.
COM1 Serial Interface Parameters
The COM1 interface is used as a local port for temporary connection of a PC (terminal)
for installation and servicing purposes and permanent connection of the SMS server
(supervision PC). It provides local monitoring, configuration, tracing and firmware
upgrade.
In the case of switch JP2, switch the COM1 interface to Ext. unit where you find the
console menu for basic Ext. unit IP settings. To locate JP2 please check the figure
below in the Configuration Jumpers section.
Basic CPU connection:
Transmission rate 57.6 kbps
Bit format start, 8bit, stop (no parity)
Signals RXD,TXD,GND
Ext. unit connection:
Transmission rate 115.2 kbps
Bit format start, 8bit, stop (no parity)
Signals RXD,TXD,GND
Tip

To communicate with the basic and enhanced CPUs at the same time via a
serial interface, use COM1 for communication with the enhanced CPU and
COM2 (located on AUX card) for communication with the basic CPU.
Lithium Battery Replacement
Warning

An incorrect battery replacement may cause explosion. The battery can
only be replaced with a battery of the same or equivalent type as
recommended by the manufacturer. Handle used batteries as instructed
by the manufacturer.
The lithium battery on the CPU board backs up the internal real time clock in case of
supply power outage. Its average life is about three years and should be replaced
preventively after that time. Replacing the lithium battery, be sure to turn the subrack
power supply unit off using the mains switch and, having loosened the two fitting
screws, push the CPU board out. Remove the old battery from the holder using a
suitable tool and insert a new one. Restore the original status taking the said steps in
the opposite order.
Battery type: CR2430.